TreeView_DragDrop event not working.

[Raj Sharma]

I have control inherited from RadTreeView.

In my constructor i have set

 

AllowDragDrop =

true;

 

void

 

TreeView_ItemDrag(object sender, RadTreeViewEventArgs e)

 

{

 

   //Does nothing

 

}

 

void

 

TreeView_DragEnter(object sender, DragEventArgs e)

 

{

e.Effect =

DragDropEffects.Move;

 

}

 

void

 

TreeView_DragDrop(object sender, DragEventArgs e)
{
  //My business logic....
}

TreeView_DragDrop even is never get executed when i drop a RadTreeNode before/after another RadTreeNode in the view.

Please help...

 

[Raj Sharma]

I also found that if i add below code then the system do execute the TreeView_DragDrop(object sender, DragEventArgs e) event

 

 

void TreeView_ItemDrag(object sender, RadTreeViewEventArgs e)

 

{

     DoDragDrop(e.Node, DragDropEffects.Move);

 

}

But this do not solve the problems as now i do not get the Line while dragging and also the RadTreeNode which I am dragging is not shown moving in RadTreeView.

Cheers,
Raj

[Victor]

Hi Raj Sharma,

Thank you for writing. Please do not mix standard OLE drag & drop method calls with the automatic drag & drop that RadTreeView provides. The DoDragDrop() method is a .NET method (not provided by Telerik) and is not guaranteed to work with Telerik controls in all cases. When you call DoDragDrop(), the method installs a modal message loop which handles all WM_MOUSEMOVE events and none get to RadTreeView, this is why you have no line. 

The OLE Drag & Drop events, methods and properties, which are members of Control are:

AllowDrop,
DragEnter,
DragLeave,
DragOver,
GiveFeedBack,
QueryContinueDrag,
DoDragDrop()

RadTreeView drag & drop events and properties are:

DragEnding,
DragEnded,
DragOverNode,
DragStarted,
DragStarting,
AllowDragDrop,
AllowDragDropBetweenTreeViews

Please choose which mechanism you will use and use it consistently. Write again if you have other questions.

Best wishes,

Victor
the Telerik team

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